Modify --isolate-extensions to not isolate hosted apps.

content/public/test/test_utils.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/public/test/test_utils.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/run_loop.h"
@@ skipping 175 matching lines @@
   loop->Run();
   return observer.result().Pass();
 }
 
 bool AreAllSitesIsolatedForTesting() {
   return base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kSitePerProcess);
 }
 
 void IsolateAllSitesForTesting(base::CommandLine* command_line) {
-  EXPECT_TRUE(SiteIsolationPolicy::IsolateAllSitesForTesting())
-      << "IsolateAllSitesForTesting() called after "
-      << "SiteIsolationPolicy was already used";
+  command_line->AppendSwitch(switches::kSitePerProcess);
 }
 
 MessageLoopRunner::MessageLoopRunner()
     : loop_running_(false),
       quit_closure_called_(false) {
 }
 
 MessageLoopRunner::~MessageLoopRunner() {
 }
 
@@ skipping 160 matching lines @@
 
 void WebContentsDestroyedWatcher::Wait() {
   message_loop_runner_->Run();
 }
 
 void WebContentsDestroyedWatcher::WebContentsDestroyed() {
   message_loop_runner_->Quit();
 }
 
 }  // namespace content